Method of tanning chamois, buckskins, or other leather



idetonted Dec. 16, 1930 PATENT. oFrIcs AUGUST ERNST, Oil? JOHNSTOWN, NEW YORK IETHOD OI TANNING CHAHOIS, BUGKSKINS, OR OTHER LEATHER He Brewing.

The present invention is a. continuation in part of my application Ser. No. 276,199 filed May 8, 1928, and relates to a method of tanning skins such as chamois, buckskins or the 5 like and has for one of its objects the provision of a method whereby an easily washable strong leather is produced that can be dyed.

- A further object is the production of a fine leather for glove. and shoe manufacture. I

Other objects will be apparent "from the following description ofmy method.

My process relates more particularly to the treatment of the skins'after the same have been limed, bated and pickled in the usual manner and comprises the step of placing the same in a revolving drum containing a bath of formaldehyde and wood alcohol in water solution. The said skins are agitated in said drum for about 45 minutes and then a mixture containing soap, moellon degras, sod oil, Glaubers salt and bicarbonate of soda is added and the skins again agitated for five or six hours, until they are tanned. The skins are then allowed to stand in this solution for about 24; hours and then a grease cutting materialsuch as sulphate of magnesia is added and the skins are agitated again for about 1 hour and then washed until neutral at 130 F. and dried and finished. A specific example of treatment of 100 pounds of the skins is herewith given.

Put said skins in a bath containing approximately 6 gallons of water, 14% pints of U. S. P. specification formaldehyde and pints of wood alcohol. Agitate the said skins 1n said drum for about minutes. Then add to said drum a mixture containing a proximately pound of soap, 2% ounds oi moellon degras, 2% pounds-of so oil, 2 ounds of Glaubers salt and 2% pounds of icarbonate of soda. Agitate the skins again for about 5 or 6 hours until they are tanned and then allow the same to stand for about 24 hours in said drum. Then add about 4 45 pounds of sulphate of magnesia and agitate the skins for about one hour. Thereafter remove the skins and wash the same tili neutra-l at about 130 F. and dry and finish the same.

For the of accuracy the moellon degree Application. filed Mai-ch27, 1930. Serial No. 439,530.

may be defined as the oil obtained from the old fashioned tanning process which uses sod oil, i. e. it is the oxidized oil pressed from the tanned leather in said old fashioned process.

By sod ,oil I mean theproduct obtaine from the greases taken from oil tanned skins by washing the latter in an alkali and then neutralizing the liquid product by treatment with acid.

The soap used is preferably a mild soap and the mixture containing the same which is added to the formaldehyde, alcohol bath may be obtained as follows Mix a mild soap flake solution, moellon deas and sod oil in proper proportions and 'oil together, then add Glaubers salt, boil again and let the same cool to a temperature 0 120 F. Then add bicarbonate of soda.

My invention ma be modified in many ways as for instance y substitution of equiv- I alents for Various of the ingredients named or by changes in the treating periods without departing from the spirit thereof and I do not wish to be limited to the details described.

What I claim is 1. A method of tanning leather including the steps of agitating cleaned limed skins in a bath containing formaldehyde and wood alcohol, then addin to said bath a mixture containing degras issolved in soa and containing sodium bicarbonate and urther agitating said skins therein until tanned, then permitting the latter to soak in said bath or a longer eriod and finally washing and drying said sE' 2. A method of tannin leather such as chamois, buckskin or the, ike, including the steps of a 'tatin cleaned, limed skins in a bath contamin ormaldehyde and wood alcohol, then adding to said bath a mixture containing sodium bicarbonate and de ras dissolved in soap and further agitating said skins therein until tanned, then soaking said skins in said bath for a further period, then cutting the grease therefrom and finally washing and drying the said skins.

3. A method of tanning leather such as chamois or the like, including the steps of adding sulphate of ma agitating cleaned, limed, pickled skins in a bath containin formaldeh de and wood alcohol, then ad%ling to sai bath a mixture containin sodium bicarbonate and degras dissolved in soap and further agitating said skins therein until tanned, then soaking said skins in said bath for a further period, then esia to said bath and further agitating the s ins therein and final- 1 Washing and drying said skins.

the skins therein and 'finally \vashing and drying said skins.

5. A method of tanning leather such as chamois or the like, includin the steps of agitating cleaned, limed, pick ed skins in a bath containing approximately for every 100 pounds of skins, 6 gallons of water, 11 pints of formaldehyde and A;% pints of wood alcohol for minutes and then adding to said bath a mixture containing, for every 100 pounds of skins, pounds of soap, 2% pounds of moellon degras, 2 4 pounds of sod oil, 2 pounds of Glaubers salt and 2% pounds of bicarbonate of soda, and agitating said skins in said bath until tanned, then soakin said skins in said bath for a longer perio then adding sulphate of magnesia to said bath and further agitating the skins therein and finally washing and drying said skins.

6. A method of tanning leather such as chamois, buckskin, or the like including the steps of agitating cleaned, limed skins in a bath containing formaldehyde and wood alcohol, then adding to said bath a mixture containing sodium bicarbonate, moellon de;. gras and sod oil dissolved in soap aifdliif ther agitating said skins therein until tanned,

then soaking said skins in said bath for a further period, thenadding sulphate of magnesia to said bath and further agitating the skins therein and finally washing and drying said skins.

7. A method of tanning leather such as chamois, buckskin, or the like including the steps of agitating cleaned, limed skins in a bath containing formaldehyde and wood alcohol for approximately 45 minutes then adding to said bath a mixture containing sodium bicarbonate, moellon degras and sod oil dissolved in a mild soap and further agitating said skins therein until tanned, then soaking said skinsthereinfor a furtherperiod, then adding sulphate of magnesia to said bath and further agitating said skins therein and finally washing and drying said skins.

8. A method of tanning leather such as chamois, buckskin or the like including the steps of agitating cleaned limed skins in a bath containing formaldehyde and wood alcohol for a period of time and then adding to said bath a mixture containing moellon degras and sod oil dissolded in soap and further agitating said skins therein until tanned.

9. A method of tanning leather such as chamois, buckskin orthe ike including the steps of agitating cleaned limed skins in a bath contalning substantially 1-1 pints of formaldehyde, /2% pints of wood alcohol and 6 gallons of water per 100 pounds of skins, for approximately 45 minutes and then adding to said bath a mixture containing moellon degras and sod oil dissolved in soa and further agitating said skins. therein untll tanned. v

10. A method of tannin leather such as buckskin or the like inclu ing the steps of agitatin cleaned limed skins .in a bath conformaldehyde and wood alcohol fortaining approximately 45 minutes, then adding a mixture containing for every 100 pounds of skins approximately pound of soap, 2 pounds of moellon degras, 2 pounds of sod oil, 2 pounds of Glaubers salt and 2% pounds of bicarbonate of soda, and agitating said skins in said bath until tanned.

11. A method of tanning leather such as chamois, buckskin or the like, including the steps of agitating cleaned limed skins in a bath containing formaldehyde, then adding a mixture containing soap, moellon degras, sod

oil, Glaubers salt and bicarbonate of soda and further agitating said skins in said bath until tanned.

In testimony whereof I afiix my signature.

AUGUST ERNST.

CERTIFICATE OF CORRECTION.

Patent No. 1,784,828. 7 Granted December 16, 1930, to

' AUGUST ERNST.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 53,for the word "sod" read cod; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and seaied this 24th day of February, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

